Secondary battery positive electrode including ferroelectric component and method of manufacturing the same

Abstract

Disclosed are a secondary battery positive electrode including a ferroelectric component and a method of manufacturing the same. The method of manufacturing the secondary battery positive electrode may use a low-priced material as the ferroelectric, so process efficiency may be improved. In addition, the secondary battery positive electrode includes the ferroelectric, such that the output performance of a secondary battery including the same may be improved while increasing the capacity at a high charge rate of the secondary battery.

What is claimed is: 
     
         1 . A secondary battery positive electrode comprising a ferroelectric, a positive electrode active material, a binder, and a conductive agent,
 wherein the ferroelectric component has a particle size of 100 nm to 5 μm.   
     
     
         2 . The positive electrode according to  claim 1 , wherein a content of the ferroelectric component is 1 to 10 wt % based on 100 wt % of the positive electrode. 
     
     
         3 . The positive electrode according to  claim 1 , wherein the ferroelectric component comprises one or more selected from the group consisting of BaTiO 3 , (Ba, Sr)TiO 3 , PbTiO 3 , LiNbO 3 , Pb(Zr, Ti)O 3 , SrBi 2 Ti 2 O 9 , and amorphous V 2 O 5 . 
     
     
         4 . The positive electrode according to  claim 1 , wherein the positive electrode active material comprises one or more selected from the group consisting of LiMn 2 O 4 , LiCoO 2 , LiNiO 2 , LiNiCoMnO 2 , LiFeO 4 , and LiMnCoNi 3 O 2 . 
     
     
         5 . A method of manufacturing a secondary battery positive electrode, comprising:
 preparing an admixture comprising a ferroelectric component and a first solvent;   preparing a positive electrode slurry comprising an active material, a binder, a conductive agent, and a second solvent;   preparing a coating slurry comprising the admixture and the positive electrode slurry;   applying the coating slurry to a substrate; and   drying the applied coating slurry.   
     
     
         6 . The method according to  claim 5 , wherein the admixture is prepared by performing ultrasonic dispersion for 7 to 15 minutes. 
     
     
         7 . The method according to  claim 5 , wherein the coating slurry is manufactured by mixing the admixture and the positive electrode slurry for 7 to 15 minutes. 
     
     
         8 . The method according to  claim 5 , wherein the drying is performed at a temperature of 75 to 95° C. 
     
     
         9 . A secondary battery comprising a positive electrode according to  claim 1 , wherein secondary battery has a capacity of 120 to 180 mAh/g at 2 to 5 C.